Locomotive boiler



Nov. 8, 1927.

O. H. HARTMANN LocoMoTIvE oILER Filed May l5, 1925 l By I THANK, F CASSEI-WILHELMSHOHE, GER/MANY, ASSIGNREO unnusuonzn, en

MANY, A CORPORATIQN 0F GERMANY. f

Locomorrvn Borana. 4

Application filed may' 13, 1925, Serial No. 29,881, and in Germany June 1G, 1926i.,

M-y present yinvention relates tn locomotive boilers constructed in .two sections forI the generation of steam of two dierent pressures. More particularly, the high pres` sure section off the boiler .embodiesla re box, y.the walls of which are formed by water tubes, while the low pressure section is con-- stituted by a longitudinal boiler having smoke iues. In order to secure complete combustion of the fuel and a high eciency, I interpose between the grate of the tire-box and the smoke lues of the longitudinal boiler, a channel-like chamber in opencommunication with the combustion chamber of the fire-box but closed at the sides as well as at the top andthe bottom. In the pre-y ferred embodiment the hollow members, such as water tubes and the like, which form thewalls of said channel, communicate with the high-pressure section, that is to say, wlth the water-tube lire-box, said channel virtually forming an extension of .the fire-box.

is novel arrangement increases the effective heatin surface of the high-pressure boiler section, since the area. of the channel is added to that of the water-,tube lire-box, for the generation of high-pressure steam. yThe proportion of high-pressure steam to low-pressure steam is thus increased, and a low fuel consumption is obtained, approxiI mating that of a boiler which produces highpressure steam exclusively.

As applied to locomotives operatingwith steam of twodierent pressures, my 1nvention offers a special advantage owin to the relative narrowness and len h of t e ire' tbox and combustion chamber. In the ordif nary constructions, whenever a locomotlve 1s to be exceptionally plowerful, the large grate 'area required for t 's purpose is obtamed by making AEthe fire-box of considerable width, since 'the length of the grate is limited by the ability o the Stoker to reach the farther portions thereof. A. wide fire-box,

area exposed to the heat radiated from the furnace, than a narrow and correspondingly long lire-box. Thus, with a wide grate, the proportion of highressure steam to lowsucient for the production of the maximum amount of high pressure steam.

, A satisfactory and preferred embodiment yof my invention is illustrated by the accomhowever, provides a much smalller heating pressure steam is re uced, and becomes in-l panyingdrawings, in which Fig. 1 is a longltudinal section of a locomotive boiler constructed according to the principle explained above, and Fig. 2 is a cross-section on line 2 -`-2 of Fi 1.

The hig -pressure section of the boiler has a lower portion with longitudinal water chambers 1 and a rear transverse water chamber 2, andan upper portion comprising one or more steam and water containers 3, connected with said lower. portion 4bywater tubes v4`vvhich cross each other as they extend ugward from opposite sides of the irebox. etween the rear flue sheet of the longitudinal low-pressure boiler section indicated at 5, and the grate 6 'of ,the fire-box is located a combustion channel, the roof and sides of which are formed by water tubes 7 extending from the lower water chambers 8 to the upper container or containers 8. The bottom or fioor of the `combustion channel is formed by water tubes 9 connecting a transverse chamber 2 located at the front of the Water-tube fire-box withV a transverse pipe or chamber 10 located at the rear due sheet of the longitudinal boiler 5. The combustion channel or chamber thus constructed affords the flame ample space for spreading and expanding, so will be obtained.

As seen in'Fig. 2, thetubes 7 extend upwardly from the chambers 8, every alternate tube bent transversely to `connect withI the header 11 on the opposite side of the boiler, while the remaining tubes extend substantially vertically to the header on the same side ofthe boiler as the base of thev tubes..y Short' tubes 13 extend from headers 11 tothe interior of container, where they connect with a series of coils 19, which l`facilitate a transfer of heat from the headers 11 to the interior of the container 3. The floor of the combustion channel is formed by longitudinal tubes 9, which are connected to headers l11 by tubes 15. Thesteam evolved in the headers passes through pipes 13 to the coils 19, and the condensate is returned through tubes 14 to the chambers 8. Plugs 12 are removably inserted in the headers to facilitate cleaning and repair. f

Various modiicationsmay be made without' departing from ,the nature of my invention as set forth in the claim.

I claim:

In a locomotive7 a Water-tube fire-box formed of vertical tubes and having a grate of normal maximum length for hand stoking, a drum communicating with the upper 5 ends of the tubes of said fire-box to form therewith a hi h-pressure Steam boiler, a fire-tube boiler 1n which low-pressure steam is generated by the combustion gases from said fire-box, said fire-tube boiler being` in- 10 dependent of said high-pressure boiler, and

water-tubes forming a constricted combustion channel located, between said lire-box and said lire-tube boiler, the-upper ends of the tubes of said combustion channel being connected to said drum to transfer heat from the combustion channel to said drum.

In testimony whereof I have hereunto set my hand.

o'rTo H. HARTMANN. 

